HomeMy WebLinkAbout26004_Dilworth Auto II Soil Assessment WP_20220328Mr. Bill Schmithorst
March 28, 2022
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Property Owning Sub, LLC and Phase II (1728 South Boulevard), which will be developed by East
South Crossing Owner, LLC. Proposed Phase I redevelopment includes construction of a
commercial and multi-family residential building at the Site. Proposed Phase II redevelopment
includes construction of a mixed retail and office building.
Proposed redevelopment at the Site (Phase I) includes installation of concrete caps atop auger cast
piles for structural support of the proposed building. Based on current redevelopment plans, these
activities are expected to generate excess soil which will need to be managed during construction.
The soil will be managed in accordance with the DEQ-approved Environmental Management Plan
(EMP) for Phase I dated October 8, 2021.
In February 2022, in-situ soil characterization assessment activities (EX-1 through EX-3) were
conducted at the Site in discrete areas that are proposed for installation of tower crane foundations
and elevators. The proposed auger cast pile cap locations are distributed across most of the Site as
shown on Figure 2. Due to the lateral extent of soil needing to be managed during installation of the
pile caps and the lack of space for soil stockpiling, this Work Plan has been prepared to outline a
proposed scope of work for conducting in-situ soil assessment activities in the areas of proposed cut
to characterize soil that may be removed from the Site as part of construction activities. The
proposed scope of work for the in-situ soil assessment activities is provided in the following
sections.
2.0 In-Situ Soil Characterization Assessment Activities
H&H proposes to conduct soil assessment activities in general accordance with DEQ Inactive
Hazardous Sites Branch Guidelines for Assessment and Cleanup dated July 2021 and the most recent
version of the U.S. Environmental Protection Agency Region IV Lab Services and Applied Science
Division Field Branches Quality System and Technical Procedures guidance.
Prior to conducting the field activities, H&H will contact North Carolina 811, the public utility
locator service, to mark subsurface utilities at the Site. In addition, a decontaminated stainless-steel
Mr. Bill Schmithorst
March 28, 2022
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hand auger will be advanced to a depth of approximately 5 feet below ground surface (ft bgs) at each
proposed boring location to further screen for potential subsurface utilities.
2.1 Soil Characterization Purpose and Objectives
H&H proposes to conduct soil assessment activities in proposed cut areas at the Site to assist in
export of soil during redevelopment activities. Based on information provided by the PD, H&H
understands that up to approximately 1,600 cubic yards of soil is anticipated to be generated during
installation of auger cast pile caps.
The PD for the AJACC Auto Brownfields property (BPN 24054-20-060) is seeking import soil for
current redevelopment at their site located southwest of the Dilworth Auto Service Site. The data
collected during the proposed in-situ soil characterization assessment activities outlined in the
following sections will be used to pre-determine whether export soil from the proposed auger cast
pile cap locations can be transported to the AJACC Auto Brownfields property for use as beneficial
fill, with DEQ Brownfields approval. If the soil is not suitable for export to the AJACC Auto
Brownfields property, the PD may request DEQ Brownfields approval for export of the soil to a
Land Clearing and Inert Debris (LCID) landfill, a construction and demolition (C&D) landfill, or
another Brownfields property for use as beneficial fill.
H&H understands that the DEQ Brownfields Program and the DEQ Solid Waste Section will review
results of the soil assessment activities and assist in determining a suitable facility for the export soil.
H&H also understands that the DEQ Solid Waste Section will issue a letter recommending the
type(s) of facilities that could manage the proposed export soil based on soil characterization
laboratory analytical results.
A summary of the proposed in-situ soil assessment activities is provided in the following sections.
Mr. Bill Schmithorst
March 28, 2022
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2.2 Soil Characterization Sampling Activities
H&H divided the Site into 10 in-situ soil characterization sections based on the proposed locations
of auger cast pile caps at the Site. H&H proposes to collect soil samples for laboratory analysis in
each soil characterization section to represent material that may need to be exported off-Site. The
in-situ soil characterization sections (denoted by “EX” nomenclature) are depicted on Figure 2.
H&H will contract with a qualified drilling contractor to advance multiple soil borings in each of the
10 soil characterization sections. One boring will be advanced within the footprint of each proposed
auger cast pile cap. The drilling contractor will advance each soil boring with a decontaminated
stainless-steel hand auger to depths of approximately 5 to 6 ft bgs based on the estimated thickness
of each proposed pile cap. During boring advancement, continuous soil samples will be collected
from each boring from the center of the hand auger bucket. The soil samples will be logged for
lithologic description, inspected for the presence of visual and olfactory indication of potential
impacts, and screened for the presence of volatile organic vapors with a calibrated photo-ionization
detector (PID).
To characterize the approximately 1,600 cubic yards of soil for export, a total of 20 in-situ soil
samples (10 grab and 10 composite as described below) will be collected for laboratory analysis.
H&H understands that to obtain approval for export to a non-permitted receiving facility, a sample
frequency of one soil sample for every 1,000 cubic yards of export soil is required. H&H is
proposing additional soil samples to provide data that is representative of the 10 soil characterization
areas and similar to the above sampling frequency. The approximate volume of export soil
represented by each in-situ soil characterization sample is indicated on Figure 2. Soil samples from
each in-situ soil characterization section will be selected for laboratory analyses as described below.
Proposed Cut Areas EX-4 through EX-6, EX-8 through EX-10, and EX-13
Approximately 5 ft of cut is anticipated in Sections EX-4 through EX-6, EX-8 through EX-10, and
EX-13 for installation of auger cast pile caps. H&H proposes to advance one soil boring within the
footprint of each proposed pile cap, for a total of six to nine soil borings in each of these in-situ
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March 28, 2022
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sections (see Figure 2). Each soil boring will be advanced to a depth of approximately 5 ft bgs, and
continuous soil sample aliquots will be collected for logging and field screening at 1 ft intervals
from each of the soil borings. Soil sample aliquots from each boring advanced in the section will be
homogenized to form one composite soil sample representative of soil from 0 to 5 ft bgs.
Proposed Cut Areas EX-7, EX-11, and EX-12
Approximately 6 ft of cut is anticipated in Sections EX-7, EX-11, and EX-12 for installation of
auger cast pile caps. H&H proposes to advance one soil boring within the footprint of each
proposed pile cap, for a total of six to eight soil borings in each of these in-situ sections (see
Figure 2). Each soil boring will be advanced to a depth of approximately 6 ft bgs, and continuous
soil sample aliquots will be collected for logging and field screening at 1 to 2 ft intervals from each
of the soil borings. Soil sample aliquots from each boring advanced in the section will be
homogenized to form one composite soil sample representative of soil from 0 to 6 ft bgs.
Based on prior Site data, investigation derived waste generated during the assessment activities will
be spread on-Site in accordance with North Carolina regulation 15A NCAC 02T.1503. Following
sampling activities, the soil borings will be properly abandoned and the surface will be restored to
approximately match pre-drilling conditions. Additionally, the soil boring locations will be
estimated using a hand-held global positioning system (GPS) unit.
2.3 Soil Characterization Sample Analyses
The composite soil samples selected for laboratory analyses will be collected directly into dedicated
laboratory-supplied sample containers, labeled with the date, time, and sample identification, and
placed in a laboratory-supplied sample cooler with ice. The samples will be submitted to a North
Carolina-certified laboratory under standard chain-of-custody protocols for analysis of semi-volatile
organic compounds (SVOCs) by EPA Method 8270 and Resource Conservation and Recovery Act
(RCRA) metals plus hexavalent chromium by EPA Methods 6020/7471/7199.
Mr. Bill Schmithorst
March 28, 2022
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In addition to the composite soil samples described above, one representative grab soil sample will
be collected within each soil characterization section, for a total of 10 grab samples. Grab samples
will be collected from the soil boring in an in-situ soil characterization section that exhibits the
highest likelihood for potential impacts based on field screening results (i.e., stained soil, elevated
PID reading, or odor). If there is no obvious evidence of potential impact in a soil boring based on
field screening results, grab samples will be collected from randomly selected soil borings and depth
intervals.
The grab soil samples will be collected from undisturbed portions of soil directly into laboratory
supplied glassware, labeled with the sample identification, date, time, and placed in a laboratory-
supplied cooler with ice. The grab samples will be submitted to a North Carolina-certified
laboratory under standard chain-of-custody protocols for analysis of VOCs by EPA Method 8260.
2.4 Quality Assurance/Quality Control
Non-dedicated equipment and tools will be decontaminated prior to use at each soil boring location
and following exposure to soil. For quality assurance and quality control purposes (QA/QC), H&H
will collect one duplicate soil sample which will be submitted for the same laboratory analysis as the
parent sample to evaluate the reproducibility of sample results.
Laboratory QA/QC procedures will be employed to ensure appropriate sample handling and analysis
and to aid in the review and validation of the analytical data. QA/QC procedures will be conducted
in accordance with the method protocols and will include regular equipment maintenance,
equipment calibrations, and adherence to specific sample custody and data management procedures.
Samples will be analyzed in conjunction with appropriate blanks, laboratory duplicates, continuing
calibration standards, surrogate standards, and matrix spiking standards in accordance with approved
methodologies to monitor both instrument and analyst performance. H&H will request that the
laboratory reporting limits for each analyte be equal to or below applicable screening criteria, where
possible. Additionally, H&H will request that the laboratory include estimated concentrations for
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March 28, 2022
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compounds that are detected at levels above the laboratory method detection limit, but below the
laboratory reporting limit (J Flags).
2.5 Reporting
Following completion of the assessment activities and receipt of the analytical data, H&H will
document our findings in an In-Situ Soil Characterization Assessment Report. The report will
include a description of the sampling activities, tabular summary and discussion of the laboratory
analytical results in comparison to the regulatory screening levels, a figure depicting the sample
locations, soil boring logs, copies of the laboratory analytical reports, and conclusions concerning
our activities. The report will also include laboratory analytical data and a figure depicting soil
sample locations from the AJACC Brownfields Property to assist the DEQ Brownfields Program in
their review of the proposed soil transfer.
We appreciate your prompt attention to this matter as redevelopment activities at the Site are
currently underway. We look forward to your approval of this Work Plan.
Should you have any questions or need additional information, please do not hesitate to call us at
(704) 586-0007.
Sincerely,
Hart & Hickman, PC
Bo Cappleman, PG Christine E. Schaefer
Due Diligence Manager Senior Project Scientist
cc: Mr. Josh Glover and Mr. Chris Hustek, Greystar (via email)
Attachments
Table 1Sample Summary TableDilworth Auto Service1714 South BoulevardCharlotte, North Carolina H&H Project No. WPP-011EX-4 through EX-13 Composite Soil SampleCharacterize soil conditions in proposed cut/soil export areas 10SVOCs by EPA Method 8270, RCRA Metals by EPA Methods 6020/7471, and hexavalent chromium by EPA Method 7199EX-4 through EX-13 Grab Soil SampleCharacterize soil conditions in proposed cut/soil export areas 10 VOCs by EPA Method 8260SOIL-DUP Soil Sample Duplicate QA/QC 1VOCs by EPA Method 8260, SVOCs by EPA Method 8270, RCRA Metals by EPA Methods 6020/7471, and hexavalent chromium by EPA Method 7199Notes:VOCs = Volatile Organic Compounds; SVOCs = semi-VOCs; RCRA = Resource Conservation and Recovery Act; QA/QC = Quality Assurance/Quality ControlSample IDsNumber of SamplesLaboratory AnalysisSample ObjectiveSample Typehttps://harthick.sharepoint.com/sites/MasterFiles-1/Shared Documents/AAA-Master Projects/White Point Partners (WPP)/WPP-011 Dilworth Auto Service/In-Situ Pile Caps/Work Plan/Tables/Sample Summary TableTable 1Hart & Hickman, PC
USGS The National Map: National Boundaries Dataset, 3DEP ElevationProgram, Geographic Names Information System, National HydrographyDataset, National Land Cover Database, National Structures Dataset,and National Transportation Dataset; USGS Global Ecosystems; U.S.Census Bureau TIGER/Line data; USFS Road Data; Natural Earth Data;U.S. Department of State Humanitarian Information Unit; and NOAANational Centers for Environmental Information, U.S. Coastal ReliefModel. Data refreshed August, 2021.
SITE LOCATION MAP
DILWORTH AUTO SERVICE1714 SOUTH BOULEVARDCHARLOTTE, NORTH CAROLINA
DATE: 2-1-22
JOB NO: WPP-011
REVISION NO: 0
FIGURE. 1
2923 South Tryon Street - Suite 100Charlotte, North Carolina 28203704-586-0007 (p) 704-586-0373 (f)License # C-1269 / # C-245 Geology
TITLE
PROJECT02,000 4,000
SCALE IN FEET
Path: \\HHFS01\Redirectedfolders\sperry\My Documents\ArcGIS\PROJECTS\WPP-011\Figure 1.mxdN
U.S.G.S. QUADRANGLE MAP
CHARLOTTE EAST, NORTH CAROLINA 2019
QUADRANGLE7.5 MINUTE SERIES (TOPOGRAPHIC)
SITE
CAMDEN ROAD
REVISION NO. 0
JOB NO. WPP-011
DATE: 3-24-22
FIGURE NO. 2
DILWORTH AUTO SERVICE
1714 SOUTH BOULEVARD
CHARLOTTE, NORTH CAROLINA
PROPOSED SOIL SAMPLE LOCATION MAP
2923 South Tryon Street-Suite 100
Charlotte, North Carolina 28203
704-586-0007(p) 704-586-0373(f)
License # C-1269 / #C-245 Geology
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NOTES:
1.PARCEL BOUNDARY DATA OBTAINED FROM
MECKLENBURG COUNTY GIS, 2022. AERIAL IMAGERY
OBTAINED FROM MECKLENBURG COUNTY GIS, 2021.
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LEGEND
BROWNFIELDS SITE PROPERTY BOUNDARY
PARCEL BOUNDARY LINE
RAILROAD
PROPOSED SOIL BORING LOCATION
AUGER CAST PILE AND CONCRETE CAP
SOIL
CHARACTERIZATION
SECTION ID
SAMPLE INTERVAL
(FT)
ESTIMATED
VOLUME (CUBIC
YARDS)
EX-4 0-5 160
EX-5 0-5 115
EX-6 0-5 110
EX-7 0-6 170
EX-8 0-5 130
EX-9 0-5 115
EX-10 0-5 205
EX-11 0-6 130
EX-12 0-6 145
EX-13 0-5 150
EX-6
EX-9
EX-13
EX-12
EX-8
EX-5
EX-11
EX-10
EX-7
EX-4
S:\AAA-Master Projects\White Point Partners (WPP)\WPP-011 Dilworth Auto Service\In-Situ Pile Caps\Figures\WPP.011_20220324.dwg, FIG.2, 3/24/2022 12:50:42 PM, sperry